Screen-shoe for grist-mills.



1. L. SMITH.

SCREEN SHOE FOR GRIST MILLS. APPLICATION FILED iuLY 21.1914.

1,147; 95, Patented Jilly 20, 1915.

4 SHEETS-SHEET I.

' XMM/OXQOMMO? Eff/$.21" w WMQM A W COLUMBIA PLANDORAPH C0-- WASHINOTON. Dv C.

J. L. SMITH.

SCREEN SHOE FOR GRISTMILLS.

APPLICATION FILED JULY 21, I914.

Patented July 20, 1915,

4 SHEETS-SHEET 2.

J. L. SMITH.

SCREEN SHOE FOR GRIST MILLS.

APPLICATION FILED JULY 27I 1914.

4 SHEETS-SHEET s.

Patented July 20, 1915.

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COLUMBIA PLANWRAPH can WMHINGTON- D. C.

J. L. SMITH.

SCREEN SHOE FOR GRIST MILLS.

APPLICATION FILED JULY 21.1914.

1,147, 1 95. Patentd July 20, 1915.

4 SHEETS-SHEET 4.

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UNITED s'ra'rnsraaanr orriou.

JOHN L. SMITH, OFSAVANNAI-I, MISSOURI.

r SCREEN-SHOE non eR sT-MILLs.

To all whom it may concern I Be it known that 1, JOHN L. SMITH, a citizen of'the United States, residingat Savannah, in the county of Andrew and State of Missouri, have invented certain new and useful Improvements in screen shoes for Grist-Mills, of which the following is a specification. i

The object of my invention is to provide a grinding mill or grist mill which maybe used in grinding corn, wheat, and other grain, and which is so constructedthat the whole grain may be fed into'the hopper or" the mill and in. its passage through the mill is ground and separated so that the fine particles are discharged at one point, the intermediate particles at another point and the coarse particles of the grain together with any trash which may have been contained with the grain as fed into the hopper will be discharged at yet a third point.

A further object is to so construct the screen or sieve which separates the ground grain according to the size of the particles that this sieve will be mounted to have a reciprocatory mo vement in an endwise and vertical swinging path, the mounting being so arranged that a greater relative movement is transmitted in a vertical direct on to the outer or discharge end thereof than to the inner-end and thus'the ground product is given the most severe treating action just prior to its discharge, the severity of the treatment increasing gradually from the feed end to the discharge end of the screen.

ith other objects in view, which will be referred to, my invention consists in the' peculiar combination and novel arrangement of parts, such as Wlll be hereinafter more fully described in connection with'the accompanying drawings and more particularly pointed out in the appended claims.

In the drawings Figure 1 is a view in side elevation of my improved mill. Fig. 2

is a top plan view of the disclosure in Ff 1. 3 is a longitudinal vertical sect onal View through the frame structure to better illustrate the operative parts. Fig. 4 is a longitudinal vertical sectional view through the grinding mechanism proper. Fig. 5 is a transverse vertical sectional view through the same mechanism. Fig. 6 is a longitudinal vertical sectional view through the screen shoe and screen to illustrate the relative placing thereof. Fig. 7 is a top plan view of the structure disclosed in Fig. 6.

, Specification of Letters Patent.

Patented July so, 1915.

- Application fiiea'aul 'ar, 1914. Serial No. 853,379.

held spaced the proper distance apartby cross'members 4c, 4;.

A main shaft 5 is connected across the c t frame upon the side members 3 and a power shaft 6 is also connected across these members to extend in a direction parallel with the extentof the main shaft 5. This power shaft 6 has a'crank handle 7 mounted thereon, although anv other suitable power-transmitting means mightbe applied, and the sprocket chain Snasses over a largesprocl zet wheel 9 secured ojn'this shaft 6 and over a small sprocket wheel 10 carried by the main shaft 5, the parts being so arranged that comparatively great increase of speed is attained in the rotation of this shaft 5 through the connection thus formed from the power shaft 6.

The grinding means comprises a grinding case 11, mounted around the shaft 5 at one end'thereof and a grinding bur 12preferably formed upon two diameters, as better shown in Fig. 4E, and provided with'the grindingfaces or surfaces'is secured on the shaft 5. to -rotate within the grindlng case i 11." .Thefhopper .13 is provided around a feed opening formed throughthe grinding casell and the grain placed in this feed;

hopper-13 willd-ischarge tothis feed open-c i ing. and is then crushed and ground between the? two orroughened outer face ofthe grindin'gfbur and ,the. roughened inner grinding face of the casell. A d scharge opening 14 is provided'topermit the ground I product to passfrom the grinding case 11 and a spout or funnel 15 is placed beneath said opening to direct the course and discharge of the ground grain.

A screen shoe l kis positionedbelow" the grinding mechanism to receive the ground grain as discharged therefrom and this screen shoe issuspended tohave reciproca torvf finovement and is connected in such a manner that a shaking 'reciprocatory movei ment is transmitted thereto. This screen shoe 14, as better disclosed in Fig. 6, comprises the sides 15 the bottom or floor 16 and a solid upper end 17 secured between the sides 15, the brackets 18 are secured to either side of the shoe 14 to extend from the upper or receiving end thereof and at their outer ends these brackets are connected with the rocking end of a yoke 19 which is pivoted in its body portion at 20 to the frame of the machine. An eccentric 21 is secured on the shaft 5 and a pitman 22 has one end thereof received around this eccentric 21, the opposite end being connected to one of the sides 15 of the screen shoe 14 by a screw 23 or other detachable means.

With the suspension as above described, the screen shoe is supported at its feed end by the connection with the yoke 19 and the connection of the pitman 22 with the side of this shoe at a point near the longitudinal center acts to complete the support of this shoe 14, and as the pitman 22 is connected with the eccentric 21, a reciprocatory or shaking motion will be transmitted to the screen shoe. Such an action as this would in some cases prove suflicient, however, a more veflicient operation is obtained when the screen shoe is shaken in such a manner that a more severe treatment is given to the grain as it approaches the discharge end thereof and to accomplish this object, I provide the rocking arm 24 which is pivoted near its center at 25 to the frame of the machine, a link 26 being provided to connect one of the arms of this rocking lever with one of the brackets 18 at its point of connection with the yoke 19, and a pitman 27 also connected to be operated by the movement of the eccentric 21 being connected with the free end of the rocking lever 24. By arranging the parts in this manner, the pitman 22 gives a reciprocatory movement to the forward part of the screen shoe and the connection from the rocking lever 24 to the bracket 1.8 causes the yoke 1.9 to be swung about its pivotal. connection 20 and the bracket 18 is carried in a path which is the are of a circle described around the point of pivotal mounting of the yoke, thus a reciprocatory movement is given to the screen shoe 14 and due to the arcuate path in which the bracket 18 is carried .by the yoke 19 this screen shoe has a rocking movement about the screw 23 or other connection with the pitman 22 so that a more severe agitation of the grain is accomplished as it approaches the discharge end of the screen sioe.

The screens proper of the shoe, as better disclosed in Fig. 9, are disposed one above the other within the shoe 14 between the sides 15. 11; is preferable that three screens, to accomplish as many separations, be provided within the screen shoe l4 and it will be understood that these screens are so placed that a coarse separation is accomplished on the upper screen and a greater refinement of the ground material takes place as each succeeding screen is reached in the downward fall of the ground material. The lowermost screen 28 is spaced somewhat above the fioor 1.6 of the screen shoe 14 and this screen could be of about sixteen mesh, the screen 29 is spaced above the screen 28 a sufficient distance that the ground material passing therethrough may have free movement over the upper surface of the screen 28 and it is preferable that this screen be of about twelve mesh. The screens 28 and 29 are extended over the entire area of the floor or bottom 16 of the screen shoe and in consequence any of the ground material which will not pass through these screens is carried on over and is discharged from the machine at the discharge end. llhe screen 30 which is disposed above the screen 29 is more in the nature of a distributing screen than a separating screen and it extends only over the upper or feed end of the screen 29, it being approximately two-thirds of the length of this screen 29. With this arrangement as set forth, the separation is into three grades, or into three degrees of relative size, and each of the products separated out must be discharged at a distinct point and into a separate container. To accomplish this object, I provide the trough 31 along the lower or discharge end of the screen 29 and a spout 32 is provided at one side of this trough to discharge the material carried over the screen 29 into the trough therefrom, a pan 33 being provided to receive the material discharged from this spout 32.

The space between the screens 28 and 29 at the lower or discharge end is left open as at 34 and the material passing through the screen 29 onto this screen 28 and of a size too large to pass through the mesh thereof is carried over the screen and discharged through the opening 34, a pan or other suitable receptacle 35 being provided to receive the material discharged from the screen. The material passing through the screen 28 is discharged onto the floor or bottom 16 of the screen shoe 14 and is prevented from passing out at the lower or discharge end thereof by a partition .36, a discharge spout 37 being provided at a point above this partition to permit the discharge of the ground material from the floor 16 and a receptacle 38 being provided at a point to receive the material as it passes from this spout 37. It is preferable thatthese screens 28, 29 and 30 be removably held in the screen shoe 14 to thus permit the substitution of other and suitable screens as the working condition of the machine may vary and to accomplish the best separating action upon the material belng ground, also, it is preferred that some means of adjusting the movement of the screen shoe 14 to accommodate the machinescreen shoe and also by providing a plurality of openings in the upper end of the rocking arm 24 to receive thepin 39 by which the pitman 27 is connected therewith, the movement of the screw 23 to a point higher up in the side of the screen shoe having the effect of tilting this screen shoe to a greater angle and the movement of the pin 39 to one of the openings at a greater distance from the pivotal connection 25 of the rocking lever 24 acting to reduce the rocking motion transmitted to the yoke 19.

From the foregoing it will be seen that I have provided a grist mill or grinding mill of comparatively small size and comprising few and simple parts, which at the same time is arranged to be adjusted to accommodate various operating conditions and which is positive and efiicient in operation.

WVhile I have herein shown and described one specific form of my invention, it will be understood that slight changes might be made in the form and arrangement of the parts without departing from the spirit and scope of my invention, and hence I do not wish to be limited thereto except for such limitations as the claims may import.

I claim:

1. A grist mill comprising a screen located at a point to receive the ground material at one end, a suspension mounting for the feed end of said screen formed to permit reciprocatory movement thereof, an eccentric, a pitman from said eccentric to the mounting of the feed end to cause reciprocatory movement thereof, and a pitman connected from the eccentric to the body portion of the screen to support the same and to cause reciprocatory movement varying from the motion transmitted to the feed end of the screen.

2. A grist mill comprising a screen located in a position to receive the ground material at one end, a suspension mounting for the feed end of said screen formed to permit reciprocatory movement thereof, an eccentric, a pitman from said eccentric to the mounting of the feed end to cause reciprocatory movement thereof, a pitman connected from the eccentric to the body portion of the screen to support the same and to cause reciprocatory movement varying from the motion transmitted to the feed end of the screen, all of said parts so arranged that the agitation of the screen and material passing thereover is increased from the feed to the discharge end and the movement of the discharge end is relatively greater than thatof the feed end, and power-transmissionw means byv which movement is given to the eccentric to cause operative movement of both ends of thescreen s multaneously.

p 3. A. grist mill comprising ap 'frame, a, shaft mounted on said frame, a screen 10-,

cated to receive the ground material atone end, yokemea'ns to suspend-the receiving,

end of said screen in the proper relation and to, be capable of reciprocatory, movement,

an eccentric carried by said shaft, and a pitman connected from said eccentric to the body portion of said screen to support the structure thereof and to cause reciprocatory and agitating movement of-(the screen.-

4. A grist mill comprising a frame, .a

shaft mounted on said frame, a screen shoe," located to have the ground material discharged thereinto at one end, separating screens mounted in said screen shoe to divide the material discharged thereto, a yoke mounting by which the upper endof said screen shoe is supported to be capable of reciprocatory movement, an eccentriccarried by said shaft, means extending from said eccentric and connected with the mounting of the upper end of said screen shoe to cause reciprocatory movement thereof, and a pitman connected from the eccentric tobetween the shoe and frame, an eccentric mounted on said shaft, a pitman connected with said eccentric and pivotally connected at its free end with the body of said screen shoe, a rocking lever mounted on the frame and at its one end connected with said pivoted yoke, a pitman connected with said eccentric and with the free end of said rocking lever, and all of said parts so arranged that upon rotation of the shaft the screen shoe has a reciprocatory and vibratory movement transmitted thereto the severity of the movement being increased as the eX- tentof the shoe has been traversed toward the discharge end.

6. A grist mill comprising a frame, a shaft mounted on said frame to be capable of rotation, a screen shoe, a yoke connected with said screen shoe and pivotally mounted on the frame to provide a flexible connecrocking lever mounted on the frame and at its one end connected with said pivoted yoke, a pitman connected with said eccentric and with the free end of said rocking lever, and all of said parts so arranged that upon rotation ofth'e shaft the eccentric is turned and reciprocatory and vibratory movement is transmittedindependently to the upper end and the'body portion of said screen shoe.

*7. A separating mechanism comprising a screen, means by which the receiving end'of said screen is supported to be capable of recipfrocato'ry movement, an eccentric mounted to be operated adjacent the mounting of the scr'eenf'a rocking'lever having connection at its one end With the screen supporting Copies of this patent may be obtained for means, a pitman from said eccentric to the opposite end "of said rocking lever to cause reciprocatory movement of the screen upon operation of theeccentric, and a pitman connected with said eccentric and at its free end With the body portion of said screen to form a support forthe screen and to transmit independent reciprocatory movement to the discharge end'the'reof.

In testimony whereof I afliX my signature in presence of two Witnesses.

HN L. SMITH.

WVitnesses;

"K. D. GRoss,

WILLIs G1 HINE.

five cents each, by addressing the Commissioner of Patents. Washington, I). 0. 

